The unofficial "couch caucus," as the New York Times once dubbed lawmakers who sleep in their offices, has been around for a while. The reason often cited is to save money, especially given the high rents in the Washington area and the cost of having to maintain a home in their congressional district. The most notable "couch caucus" member over the years was then-House Majority Leader Dick Armey of Texas, who made his office couch his bed away-from-home in the 1990s.

While House Democrats sometimes sleep in their offices, it's become more of a Republican thing. HuffPo reports Republicans Matt Salmon of Arizona, Doug Collins of Georgia, Rodney Davis of Illinois and Markwayne Mullin of Oklahoma are the four freshmen who've decided to sleep in their offices -- at least for now.